Today in 2005, US Patent 6953256 B2 was issued, an invention of Brent Turner, for his “Illuminated Tap Handle.” Here’s the Abstract:

One object of the invention is to provide an illuminated tap handle including a handle with one end capable of being secured to a tap and a threadable and detachable end allowing the placement of a removable energy source into the handle completing a circuit and illuminating a light source connected to a conducting strip inside the handle when the threadable end is substantially threaded onto the handle and a conducting portion on the threadable end touches the conducting strip and energy source. Another object is where the conducting strip is situated within the tap handle such that when the threadable end is partially or completely unthreaded the tension of the conduction strip is released and situated just above and not touching the energy source, but when the threadable end is substantially threaded onto the tap handle, the conducting strip is again pressed onto the energy source completing the circuit.